The Once and Future Flash



Critic Consensus: It's a not-so-wonderful life for Barry Allen during this foray into an alternate and bleak future, making for an emotionally wrenching -- if not particularly subtle -- high-concept episode.

Episode Info

Barry travels to 2024 to find out Savitar's still unknown identity in the hopes of saving Iris. He encounters future versions of his Team Flash friends, who, following the death of Iris, have become very different people. Meanwhile, back in the present, the hunt for Killer Frost continues.


Grant Gustin
as Barry Allen/The Flash
Candice Patton
as Iris West
Danielle Panabaker
as Caitlin Snow/Killer Frost
Carlos Valdes
as Cisco Ramon
Jesse L. Martin
as Det. Joe West
Tom Cavanagh
as Harrison Wells
Show More Cast

The Once and Future Flash Videos

The Once and Future Flash Photos

Critic Reviews for The Once and Future Flash

Powerfully cruel.

Aug 2, 2018 | Full Review…

However, the episode had a lot of missed opportunities in terms of showcasing intimate and meaningful moments between Barry and Iris.

Aug 1, 2018 | Rating: 6/10 | Full Review…

It's interesting to learn Killer Frost chooses to join Savitar, in part, because he isn't trying to change her.

Jul 31, 2018 | Full Review…

When you decide to let your time traveling hero start mucking around in the future to fix his problems, you open yourself up to a whole host of problems. And that's pretty much what happened here.

Jul 31, 2018 | Full Review…

"The Once and Future Flash" flirts with some intriguing ideas - including the necessity of family and what happens when superheroes can no longer keep up the fight - but there is a lack of nuance in the writing.

Aug 1, 2018 | Rating: 3/5 | Full Review…

Disclosure time: I fully expected to hate "The Once and Future Flash."

Jul 30, 2018 | Rating: 5/5 | Full Review…

At times, the hour veers too far into grief-porn territory; however, it feels like there's a purpose.

Jul 26, 2018 | Rating: B | Full Review…

The episode really comes to life, and a lot of the credit is due to director Tom Cavanagh.

Jul 25, 2018 | Rating: B | Full Review…

The Once and Future Flash finally felt like a Flash episode with a purpose. Not surprisingly, it was one of the better episodes of Season 3.

Apr 26, 2017 | Rating: 9.5/10 | Full Review…

Barry Allen still hasn't learned not to mess with time.

Apr 26, 2017 | Full Review…